Github
$ ssh -T git@github.com $ git@github.com: Permission denied (publickey).
Huh?
The .ssh directory itself looks fine.
Checked logs with
ssh -vT git@github.com
or
ssh -vvv git@github.com
Error traces point to the key.
Checked Github SSH Key on the web page.
It’s gone!
Turns out SSH public keys have an expiration date and get automatically deleted.
Recreated and set it up. Problem solved.